But it's not too late to fix the problem, according to the United Nations' first comprehensive report on biodiversity.
"We have reconfigured dramatically life on the planet," report co-chairman Eduardo Brondizio of Indiana University said at a press conference.
Species loss is accelerating to a rate tens or hundreds of times faster than in the past, the report said. More than half a million species on land "have insufficient habitat for long-term survival" and are likely to go extinct, many within decades, unless their habitats are restored. The oceans are not any better off.
"Humanity unwittingly is attempting to throttle the living planet and humanity's own future," said George Mason University biologist Thomas Lovejoy, who has been called the godfather of biodiversity for his research. He was not part of the report.
"The biological diversity of this planet has been really hammered, and this is really our last chance to address all of that," Lovejoy said.
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